#include "usart.h"	  
 

#if 1
#pragma import(__use_no_semihosting)             
struct __FILE 
{ 
	int handle; 

}; 

FILE __stdout;       
 
void sys_exit(int x) 
{ 
	x = x;
} 
    int fputc(int ch, FILE *f)
    {      
    while((USART1->SR&0X40)==0) ;   
    USART1->DR = (u8) ch; 
    return ch;
    }
#endif 


 /* 
int fputc(int ch, FILE *f)
{
	USART_SendData(USART1, (uint8_t) ch);

	while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) {}	
   
    return ch;
}
int GetKey (void)  { 

    while (!(USART1->SR & USART_FLAG_RXNE));

    return ((int)(USART1->DR & 0x1FF));
}
*/
 
u8 USART_RX_BUF[64];     

u8 USART_RX_STA=0;       

void uart1_init(u32 bound)
{
	
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
	GPIO_Init(GPIOA, &GPIO_InitStructure);  
	
	USART_InitStructure.USART_BaudRate = bound;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
	USART_Init(USART1, &USART_InitStructure);
	USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
	USART_Cmd(USART1, ENABLE);                     
}
void USART1_IRQHandler(void)                	
	{
	u8 Res;
	if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  
		{
		Res =USART_ReceiveData(USART1);//(USART1->DR);	
		
		if((USART_RX_STA&0x80)==0)
			{
			if(USART_RX_STA&0x40)
				{
				if(Res!=0x0a)USART_RX_STA=0;
				else USART_RX_STA|=0x80;
				}
			else 
				{
				if(Res==0x0d)USART_RX_STA|=0x40;
				else
					{
					USART_RX_BUF[USART_RX_STA&0X3F]=Res ;
					USART_RX_STA++;
					if(USART_RX_STA>63)USART_RX_STA=0;
					}		 
				}
			}   		 
     } 
} 
